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rospy does not support the unreliable (UDP) transport. ( http://answers.ros.org/question/28322/unreliable-udp-transport-hints-in-rospy-and-rosjava/ ).

If you want to use a raw UDP socket in your node to communicate with some other, non-ROS UDP device, you'll need to write raw sockets code (or find a different library to wrap your UDP sockets)